Stepper motor driven negative pressure pulse generator

Details Stepper motor driven negative pressure pulse generator Stepper motor driven negative pressure pulse generator

1991-03-06

1992-05-19

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 83, G01V 140

Patent

active

051154153

ABSTRACT:
Variable control of the stroke and timing of the poppet in a pressure pulse generator system provides desired control for varying down hole conditions. A stepper motor interconnected to the poppet provides variable acceleration and variable position for the poppet under the control of a motor controller and motor driver which establish the number of steps and timing of steps for the motor. Various valve position profiles are provided in a memory for specific stroke and acceleration operation of the valve under varying down hole conditions and signaling requirements.

REFERENCES:
patent: 3983948 (1976-10-01), Jeter
patent: 3997867 (1976-12-01), Claycomb
patent: 4386422 (1983-05-01), Mumby et al.
patent: 4825421 (1989-04-01), Jeter
patent: 4837753 (1989-06-01), Morris et al.
patent: 4839870 (1989-06-01), Scherbetskoy

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